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Use automatic white point correction in iPhoto 5
Authored by: da5idonimac on Feb 10, '05 10:49:02AM

here's how it works:
when doing a white point correction, iPhoto (in this case) takes the color value of selected point to be absolut white (and makes it absolut white, which means all color channels go to 100%).

all other colors are changed accordingly - if the red channel needs to go up 10% in order to get the "white point" white, all other colors get 10% more red too.

the black/white values (luminance, contrast) *should* not get changed (if i recall correctly).

why is this useful? well, our eyes are funny - when looking around, our eye automatically makes its own white color correction - but if we take pictures, the camera (or photo editing app) has to do that for us. good cameras actually have that feature.

example: take pictures of a snowy landscape. to your eye (without the camera) it looks white, but the picture will show the snow blueish. use white point correction, and everything looks like it should.

i wish i could explain this better, but maybe you get what i am talkign about :)

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